Removal of Disinfection By-products Precursors in Water with Hydroxyl Free Radical
Date Issued
2005
Date
2005
Author(s)
Wu, Ching-Fang
DOI
zh-TW
Abstract
In Taiwan, chlorination is widely used as a disinfectant in water treatment process. However, many studies have shown that chlorination process results in the formation of Disinfection By-Products (DBPs), and Br-DBPs are formed in raw water containing bromide. In conventional water treatment process, the natural organic matter (NOM) removal is low, about 10% to 40 %. The objective of this study is to use Fenton process and ozonation to remove NOM in raw water and to evaluate their effectiveness to reduce DBPs formation potential.
The results indicated that pH is an important factor in advanced oxidation process. In Fenton oxidation process, 40% ~ 50% NPDOC of the fulvic acid and Kinmen raw water is removed at pH=3. The Fenton process contains oxidation and coagulation mechanism at pH=4. For fulvic acid, about 70% of NPDOC is removed; for Kinmen raw water, about 60% NPDOC is removed. The DBPFP was reduced after AOPs due to the reduction of the organic precursor. Compared with Fenton process, the reaction mechian changes with pH in ozonation process. At pH 10, both the oxidation rate and final NPDOC removed ratio are better than that at pH 7. When the particulate organic matter were not removed form water before ozonation, the NPDOC is increased. And if reaction time is longer than 30min, BrO3- will be formed in water.
In general, both Fenton process and ozonation can remove organic matter from water, and the effective is based on pH and reaction time. However, the reaction condition is different with different source water, and it is important to evaluate its suitability before AOP is adopted.
Subjects
氫氧自由基
消毒副產物
臭氧
Hydroxyl Free Radical
DBP
Ozonation
Fenton
Type
thesis
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